Apparatus for optical fiber communication using travelling wave acousto- optical modulator and injection locked lasers

摘要

Method and apparatus for frequency domain modulation optical fiber communication particularly useful for digital and analog signal transmission comprising, in the order recited, a plurality of parallel- connected signal input units each incorporating individual laser sources provided with means modulating the output radiations of said laser sources responsive to individual signal inputs, thereby establishing, for each signal input, an individual optical information wave train, a collimating lens, an acousto-optical modulator means introducing a sub- carrier signal developing a beat frequency with said optical information wave train, an optical fiber coupler transmitting the resulting signal through an optical fiber to a common square law detector and an information receiver isolating a preselected individual signal input according to its associated individual sub-carrier frequency, said individual sub-carrier frequencies being spaced one from another by a frequency interval forestalling interference in the reception of said individual signal inputs.